L
- (Renfrew County) Lost Nation
- (Huron County) Lothian
- (Parry Sound District) Lotz Island
- (Northumberland County) Loughbreeze
- (Grey County) Louise
- (Bruce County) Lovat
- (Simcoe County) Lovering
- (Renfrew County) Lower Dacre
- (Frontenac County) Lower Holleford
- (Bruce County) Lower Langside
- (Renfrew County) Lower Stafford
- (Ottawa) Lowertown
- (Cochrane District) Lowther
- (Huron County) Loyal
- (Huron County) Lucknow
- (Grey County) Lueck Mill
- (Renfrew County) Lundys Corners
- (Elgin County) Luton
- (Haliburton County) Lutterworth
- (Regional Municipality of Waterloo) Luxemburg
- (United Counties of Leeds and Grenville) Lyn
- (Elgin County) Lynhurst
- (Ottawa) Lynwood Village
- (Elgin County) Lyons
- (Simcoe County) Leigh's Corners
- (United Counties of Leeds and Grenville) Lansdowne
- (Bruce County) Lion's Head
- (Nipissing District) Lavigne
- (Regional Municipality of Waterloo) Linwood
- (Comtés unis de Prescott et Russell) L'Orignal